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| 3 | <title>Procyon AVRlib: bitbuf.h Source File</title> |
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| 8 | <h1>bitbuf.h</h1><a href="bitbuf_8h.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/*! \file bitbuf.h \brief Multipurpose bit buffer structure and methods. */</span> |
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| 9 | 00002 <span class="comment">//*****************************************************************************</span> |
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| 10 | 00003 <span class="comment">//</span> |
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| 11 | 00004 <span class="comment">// File Name : 'bitbuf.c'</span> |
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| 12 | 00005 <span class="comment">// Title : Multipurpose bit buffer structure and methods</span> |
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| 13 | 00006 <span class="comment">// Author : Pascal Stang - Copyright (C) 2001-2002</span> |
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| 14 | 00007 <span class="comment">// Created : 7/10/2002</span> |
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| 15 | 00008 <span class="comment">// Revised : 7/10/2002</span> |
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| 16 | 00009 <span class="comment">// Version : 0.5</span> |
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| 17 | 00010 <span class="comment">// Target MCU : any</span> |
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| 18 | 00011 <span class="comment">// Editor Tabs : 4</span> |
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| 19 | 00012 <span class="comment">//</span><span class="comment"></span> |
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| 20 | 00013 <span class="comment">/// \ingroup general</span> |
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| 21 | 00014 <span class="comment">/// \defgroup bitbuf Generic Bit-Buffer Structure and Function Library (bitbuf.c)</span> |
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| 22 | 00015 <span class="comment">/// \code #include "bitbuf.h" \endcode</span> |
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| 23 | 00016 <span class="comment">/// \par Overview</span> |
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| 24 | 00017 <span class="comment">/// This bit-buffer structure provides an easy and efficient way to store and</span> |
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| 25 | 00018 <span class="comment">/// process bits. You can create as many bit buffers as you like (within</span> |
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| 26 | 00019 <span class="comment">/// memory limits), and then use this common set of functions to access each</span> |
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| 27 | 00020 <span class="comment">/// buffer. Supported functions include sequential getting and storing of</span> |
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| 28 | 00021 <span class="comment">/// bits, array-like get, buffer flush (dump data), and reset-to-beginning.</span> |
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| 29 | 00022 <span class="comment">/// This buffer is not dynamically allocated, it has a user-defined fixed </span> |
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| 30 | 00023 <span class="comment">/// maximum size.</span> |
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| 31 | 00024 <span class="comment">///</span> |
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| 32 | 00025 <span class="comment"></span><span class="comment">// This code is distributed under the GNU Public License</span> |
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| 33 | 00026 <span class="comment">// which can be found at http://www.gnu.org/licenses/gpl.txt</span> |
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| 34 | 00027 <span class="comment">//</span> |
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| 35 | 00028 <span class="comment">//*****************************************************************************</span><span class="comment"></span> |
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| 36 | 00029 <span class="comment">//@{</span> |
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| 37 | 00030 <span class="comment"></span> |
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| 38 | 00031 <span class="preprocessor">#ifndef BITBUF_H</span> |
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| 39 | 00032 <span class="preprocessor"></span><span class="preprocessor">#define BITBUF_H</span> |
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| 40 | 00033 <span class="preprocessor"></span> |
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| 41 | 00034 <span class="comment">// structure/typdefs</span> |
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| 42 | 00035 |
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| 43 | 00036 <span class="comment">// the BitBuffer structure</span> |
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| 44 | 00037 <span class="keyword">typedef</span> <span class="keyword">struct </span>struct_BitBuf |
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| 45 | 00038 { |
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| 46 | 00039 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *dataptr; <span class="comment">// the physical memory address where the buffer is stored</span> |
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| 47 | 00040 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> size; <span class="comment">// the allocated byte size of the buffer</span> |
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| 48 | 00041 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> bytePos; <span class="comment">// current byte position</span> |
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| 49 | 00042 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> bitPos; <span class="comment">// current bit position</span> |
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| 50 | 00043 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> datalength; <span class="comment">// the length of the data (in bits) currently in the buffer</span> |
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| 51 | 00044 <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> dataindex; <span class="comment">// the index (in bits) into the buffer where the data starts</span> |
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| 52 | 00045 } BitBuf; |
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| 53 | 00046 |
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| 54 | 00047 <span class="comment">// function prototypes</span> |
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| 55 | 00048 <span class="comment"></span> |
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| 56 | 00049 <span class="comment">//! initialize a buffer to start at a given address and have given size</span> |
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| 57 | 00050 <span class="comment"></span><span class="keywordtype">void</span> <a class="code" href="group__bitbuf.html#ga1">bitbufInit</a>(BitBuf* bitBuffer, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *start, <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> bytesize); |
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| 58 | 00051 <span class="comment"></span> |
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| 59 | 00052 <span class="comment">//! get the bit at the current position in the buffer</span> |
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| 60 | 00053 <span class="comment"></span><span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <a class="code" href="group__bitbuf.html#ga2">bitbufGet</a>(BitBuf* bitBuffer); |
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| 61 | 00054 <span class="comment"></span> |
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| 62 | 00055 <span class="comment">//! get a bit at the specified index in the buffer (kind of like array access)</span> |
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| 63 | 00056 <span class="comment"></span><span class="comment">// ** note: this does not remove/delete the bit that was read</span> |
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| 64 | 00057 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> <a class="code" href="group__bitbuf.html#ga3">bitbufGetAtIndex</a>(BitBuf* bitBuffer, <span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> bitIndex); |
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| 65 | 00058 <span class="comment"></span> |
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| 66 | 00059 <span class="comment">//! store a bit at the current position in the buffer</span> |
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| 67 | 00060 <span class="comment"></span><span class="keywordtype">void</span> <a class="code" href="group__bitbuf.html#ga4">bitbufStore</a>(BitBuf* bitBuffer, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> bit); |
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| 68 | 00061 <span class="comment"></span> |
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| 69 | 00062 <span class="comment">//! return the number of bits in the buffer</span> |
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| 70 | 00063 <span class="comment"></span><span class="keywordtype">unsigned</span> <span class="keywordtype">short</span> <a class="code" href="group__bitbuf.html#ga5">bitbufGetDataLength</a>(BitBuf* bitBuffer); |
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| 71 | 00064 |
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| 72 | 00065 <span class="comment">// check if the buffer is full/not full (returns non-zero value if not full)</span> |
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| 73 | 00066 <span class="comment">//unsigned char bitbufIsNotFull(cBuffer* buffer);</span> |
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| 74 | 00067 <span class="comment"></span> |
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| 75 | 00068 <span class="comment">//! resets the read/write position of the buffer to beginning</span> |
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| 76 | 00069 <span class="comment"></span><span class="keywordtype">void</span> <a class="code" href="group__bitbuf.html#ga6">bitbufReset</a>(BitBuf* bitBuffer); |
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| 77 | 00070 <span class="comment"></span> |
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| 78 | 00071 <span class="comment">//! flush (clear) the contents of the buffer</span> |
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| 79 | 00072 <span class="comment"></span><span class="keywordtype">void</span> <a class="code" href="group__bitbuf.html#ga7">bitbufFlush</a>(BitBuf* bitBuffer); |
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| 80 | 00073 |
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| 81 | 00074 <span class="preprocessor">#endif</span> |
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| 82 | 00075 <span class="preprocessor"></span><span class="comment">//@}</span> |
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| 83 | </span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Sun Oct 29 03:41:06 2006 for Procyon AVRlib by |
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| 85 | <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.2 </small></address> |
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